对于任何问题一知半解的知识都是危险的。

It is dangerous that you have a smattering of superficial knowledge on a subject.

youdao

很多时候，人们会遇上麻烦是因为他们凭借着一知半解的知识就采取行动，但结果显示他们的知识并不足以应付手头上的问题。

Very often people get into trouble because they act on something which they know only a little about, and it turns out that their knowledge is not adequate enough to deal with the problem they have.

youdao

So if you guys have had-- many health professionals say that there's not enough nutrition education out there, that most people don't learn it in the schools, people aren't getting it so much from families because families don't know a lot about nutrition, but the fact is you've had a lot of nutrition education and you've just proven it.

也许大家听说过,很多健康专家声称,现在的营养教育很匮乏,许多人在学校里学不到这方面的知识,在家里也得不到多少这类信息,因为很多家长对营养一知半解,但事实上你们已接受了大量的营养知识,刚才你们已经证明了这点

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选